/* tcpserver.c */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>


int main()
{
    int sock, connected, bytes_recieved , true = 1;  
    char send_data [1024] , recv_data[1024];       
    
    struct sockaddr_in server_addr,client_addr;    
    int sin_size;
    
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("Socket");
        exit(1);
    }
    
    if (setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&true,sizeof(int)) == -1) {
        perror("Setsockopt");
        exit(1);
    }
    
    server_addr.sin_family = AF_INET;         
    server_addr.sin_port = htons(2000);     
    server_addr.sin_addr.s_addr = INADDR_ANY; 
    bzero(&(server_addr.sin_zero),8); 
    
    if (bind(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr))
        == -1) {
        perror("Unable to bind");
        exit(1);
    }
    
    if (listen(sock, 5) == -1) {
        perror("Listen");
        exit(1);
    }
    
	printf("\nTCPServer Waiting for client on port 2000");
    fflush(stdout);

    
    while(1)
    {  
        
        sin_size = sizeof(struct sockaddr_in);
        
        connected = accept(sock, (struct sockaddr *)&client_addr,&sin_size);
        
        printf("\n I got a connection from (%s , %d)",
               inet_ntoa(client_addr.sin_addr),ntohs(client_addr.sin_port));
        
        while (1)
        {
            printf("\n SEND (q or Q to quit) : ");
            gets(send_data);
            
            if (strcmp(send_data , "q") == 0 || strcmp(send_data , "Q") == 0)
            {
                send(connected, send_data,strlen(send_data), 0); 
                close(connected);
                break;
            }
            
            else
                send(connected, send_data,strlen(send_data), 0);  
            
            bytes_recieved = recv(connected,recv_data,1024,0);
            
            recv_data[bytes_recieved] = '\0';
            
            if (strcmp(recv_data , "q") == 0 || strcmp(recv_data , "Q") == 0)
            {
                close(connected);
                break;
            }
            
            else 
                printf("\n RECIEVED DATA = %s " , recv_data);
            fflush(stdout);
        }
    }       
    
    close(sock);
    return 0;
} 